US3755276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing conjugated dienes
Assignee: Bridgestone Firestone Inc
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Filing: 1971-02-17
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Granted: 1973-08-28
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Expires: 1991-02-17
Abstract
Abstract The process described herein involves a method of converting relatively low molecular weight polymers by postreaction with a mixture of divinyl benzene and a haloalkane having no more than one halogen atom on any carbon atom, in the presence of an alkali metal catalyst, such as butyl lithium to give higher molecular weight polymers having improved cold flow resistance, processibility, green strength, etc. The improvements are much greater than can be effected by postreaction with either divinyl benzene or the haloalkane individually, or by having divinyl benzene present during the copolymerization. The haloalkanes include chloro, bromo, and iodo compounds and can have 1-4 or even more halogen atoms per molecule provided there are no more than one halogen atom on any carbon atom.
Inventors
- 👤 R Oldack
- 👤 A Halasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
CPC Classifications
C; C08; C08C; C08C19/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
16 words
The process of claim 1 in which said reaction is conducted for at least 1 hour.
Claim 2
Dependent Claim
23 words
The process of claim 1 in which said reaction is conducted until there has been at least 50 percent increase in molecular weight.
Claim 3
Dependent Claim
12 words
The process of claim 1 in which said temperature is 20*-120* C.
Claim 4
Dependent Claim
15 words
The process of claim 1 in which said alkali metal catalyst is a lithium alkyl.
Claim 5
Dependent Claim
14 words
The process of claim 1 in which said alkali metal catalyst is n-butyl lithium.
Claim 6
Dependent Claim
24 words
The process of claim 1 in which said haloalkane is used in a proportion of 0.25-10 millimole per 100 parts by weight of polymer.
Claim 7
Dependent Claim
20 words
The process of claim 1 in which said divinyl benzene is used in an amount approximately equimolar with the halogen.
Claim 8
Dependent Claim
11 words
The pRocess of claim 1 in which said polymer is polybutadiene.
Claim 9
Dependent Claim
25 words
The process of claim 1 in which said polymer is a copolymer of butadiene and styrene containing 5-50 percent by weight of styrene copolymerized therein.
Claim 10
Dependent Claim
27 words
The process of claim 1 in which said divinyl benzene is used in an amount of at least 0.1 millimole per 100 parts by weight of polymer.
Claim 11
Dependent Claim
12 words
The process of claim 11 in which said haloalkane is sec.-butyl chloride.
Claim 12
Dependent Claim
12 words
The process of claim 1 in which said haloalkane is sec.-butyl chloride.
Claim 13
Dependent Claim
22 words
The process of claim 1 in which said alkali metal catalyst is a lithium alkyl, and said polymer is a polymeric butadiene.
Claim 14
Dependent Claim
11 words
The process of claim 14 in which said haloalkane is 1,3-dichloro-2-methyl-propane.
Claim 15
Dependent Claim
11 words
The process of claim 14 in which said haloalkane is sec.-chloro-n-butane.
Claim 16
Dependent Claim
22 words
The process of claim 14 in which said polymeric butadiene is a butadiene-styrene copolymer having 5-50 percent by weight styrene copolymerized therein.
Claim 17
Dependent Claim
12 words
The process of claim 14 in which said polymeric butadiene is polybutadiene.
Claim 18
Dependent Claim
11 words
The process of claim 1 in which said polymer is polyisoprene.
Claim 19
Dependent Claim
21 words
The process of claim 1 in which said polymer is an isoprene-styrene copolymer having 5-50 percent by weight styrene copolymerized therein.
Claim 20
Dependent Claim
10 words
A polymer produced according to the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |